Ratios with fractions

How do you find the unit rate of 2 numbers?

A container with  $2\frac{1}{2}$   gallons of weed killer can spray  $3\frac{3}{4}$  lawns. How many gallons would it take to spray 9 lawns? 

A printer cartridge with  $2\frac{1}{2}$ milliliters of ink will print off  $\frac{2}{3}$ of a box of paper. How many milliliters of ink will it take to print an entire box? 

A cookie recipe called for  $3\frac{1}{2}$ cups of sugar for every  $2\frac{1}{3}$ cups of flour. If you made a batch of cookies using 6 cup of flour, how many cups of sugar would you need?

A bucket of water was  $\frac{1}{4}$  full, but it still had  $2\frac{4}{5}$  gallons of water in it. How much water would be in one fully filled bucket?